[R] Exporting plots generated by a 'for' loop

[Sarah Goslee]

I don't think jpeg supports pages, but you have other options, including one you asked about:
Use a device like pdf() that supports pages and don't call dev.off() until the loop has finished.
Use paste() to give each graph a separate name, rather than overwriting them at each iteration, such as jpeg(paste("samplo", i, ".jpg", sep=".")).

Sarah

On Apr 28, 2012, at 6:40 lAM, Tejas Kale <kaletejas2006 at gmail.com> wrote:

> Hello!
> 
> I have a 'for' loop that generates a plot with each iteration. I would
> either like the plots to be stacked one below the other in a single
> .jpg file or be stored in three different files with each file being
> named dynamically. The following code is an illustration of my query
> (but does not accomplish my aim):-
> 
> for (i in 1:4)
> {
>   jpeg("samplo.jpg")
>   par(mfrow=c(3,1))
>   plot(iris[,i+1]~iris[,i])
>   dev.off()
> }
> 
> Is it possible to fulfill any of my two desires? If not, what is the
> best alternative I have? I hope I have put forth my question clearly.
> 
> Many thanks for all your help.
> 
> Regards
> Tejas Kale
> IUCAA, Pune, India
> 
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